linux-kernel - Re: [PATCH 1/2] dt-bindings: regulator: Add bindings for Richtek RT5190A PMIC

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Message-ID: <060968dc-9460-1b75-12a7-cb0bbe9563cc@canonical.com>
Date:   Mon, 7 Mar 2022 14:27:39 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     ChiYuan Huang <u0084500@...il.com>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        cy_huang <cy_huang@...htek.com>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: regulator: Add bindings for Richtek
 RT5190A PMIC

On 07/03/2022 14:21, ChiYuan Huang wrote:
> Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com> 於 2022年3月7日 週一 下午7:14寫道：
>>
>> On 07/03/2022 11:08, cy_huang wrote:
>>> From: ChiYuan Huang <cy_huang@...htek.com>
>>>
>>> Add bindings for Richtek RT5190A PMIC.
>>>
>>> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
>>> ---
>>>  .../regulator/richtek,rt5190a-regulator.yaml       | 138 +++++++++++++++++++++
>>>  1 file changed, 138 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/regulator/richtek,rt5190a-regulator.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/regulator/richtek,rt5190a-regulator.yaml b/Documentation/devicetree/bindings/regulator/richtek,rt5190a-regulator.yaml
>>> new file mode 100644
>>> index 00000000..b9f5836
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/regulator/richtek,rt5190a-regulator.yaml
>>> @@ -0,0 +1,138 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/regulator/richtek,rt5190a-regulator.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Richtek RT5190A PMIC Regulator
>>> +
>>> +maintainers:
>>> +  - ChiYuan Huang <cy_huang@...htek.com>
>>> +
>>> +description: |
>>> +  The RT5190A integrates 1 channel buck controller, 3 channels high efficiency
>>> +  synchronous buck converters, 1 LDO, I2C control interface and peripherial
>>> +  logical control.
>>> +
>>> +  It also supports mute AC OFF depop sound and quick setting storage while
>>> +  input power is removed.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - richtek,rt5190a
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  interrupts:
>>> +    maxItems: 1
>>> +
>>> +  vin2-supply:
>>> +    description: phandle to buck2 input voltage.
>>> +
>>> +  vin3-supply:
>>> +    description: phandle to buck3 input voltage.
>>> +
>>> +  vin4-supply:
>>> +    description: phandle to buck4 input voltage.
>>> +
>>> +  vinldo-supply:
>>> +    description: phandle to ldo input voltage
>>> +
>>> +  richtek,buck1-fixed-microvolt:
>>> +    description: buck1 fixed voltage that depends on the external resistor.
>>> +    $ref: "/schemas/types.yaml#/definitions/uint32"
>>
>> You should use standard bindings for it.
>>
> Sorry, I didn't get the point for the meaning 'standard binding'.
> Do you mean to change 'richtek,buck1-fixed-microvolt' or 'uint32' definition?
> This voltage depends on the external resistor selection. It's 'fixed'
> by the application.

I meant that you should not have dedicated binding to set regulator
voltage, but use regulator-min/max-microvolt instead, within one
regulator node. Just set min/max to same level and handle it in the
driver. See for example:
drivers/regulator/scmi-regulator.c


Best regards,
Krzysztof